Gustav pfannkuche



G. PFANNKUGHE. ELECTRIC GONVERTER.

No. 466,937. v Patented Jan. 12, 1892.

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GUSTAV PFANNKUCI-IE, or oL'EvELAND, OHIO, ASSIGNOR TO THE BRUSH ELECTRIC COMPANY, or SAME PLACE.

ELECTRIC. CONVERTER.

SPECIFICATION forming part of Letters Patent No. 466,937, dated January 12, 1892.

Applioation filed September 23, 1889. Serial No. 325,402. (No model.) I

To all whom it may concern:

Be it known that I, GUSTAV PFANNKUOHE, of Cleveland, in the county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Converters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in converters; and it consists in certain features of construction and combinations of parts, as

will be hereinafter explained, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a plan view of my improvement. Fig. 2 is a view in side elevation. Fig. 3 is a vertical section. Fig. 4 is a vertical section taken through one end of the core, showing the clamps for connecting together the two parts of the core. Fig. 5 is a plan of the blank from which the core-sections are punched. Fig. 6 is a plan view of one of the blanks, and Fig. 7 is a plan view of two blanks placed in position to form the core.

In making a converter according to my invention I take a strip of thin plate-iron of the proper width and punch out two blanks AA, as illustrated in Figs. 5 and 6, each blank consisting of a long arm 13 and short arm 0. The ends of the long and short arms are each perforated at a and b for the passage of a wooden pin, while the long armsB are each provided with an elongated ventilating-slot I). By forming the blanks from a strip, as shown in Fig. 6, there is no waste material produced in cutting or punching. The blanks are disposed in the manner shown in Fig. 7 and form a hollow rectangle.

The thin-iron plate-blanks may be varnished and any desired number formed into a pile, thin sheets of paper E being inserted between the blanks to insulate them from each other. After the two sections of the 0011- verter-core have been formed in the manner described the primary and secondary coils are wound on each section in the following manner: A section of the core is placed in a lathe and corner-pads F, of vulcanized-fiber cotton or other suitable material, are applied to the corners of the core and the coarse wire G, forming the secondary coil, is wound upon the corner pads, thereby forming ventilatingspaces H between the secondary coil and the core. To the corners of the secondary coil are applied similar corner-pads F, upon which is wound the fine wire I, which constitutes the primary coil, and the ventilating-spaces J, formed between the secondary and primary coils. The two sections of the core are then placed together in the manner illustrated in Figs. 1 and 7 and are drawn into close and intimate contact with each other and secured by means of the wooden pins K and J and German-silver draw-clamps L, the latter being constructed with conical sockets Z, in which the conical ends of the wooden pins are wedged or otherwise secured.

The converter will be inserted into a suitable box, and in practice the pile of plates A will be maintained in place by means of suitable rods passing over the ends of the plates at the top and bottom of the pile and secured at their ends to the sides of said box.

The central ventilating-space M of the core and the ventilating-slots D formed in the arms of the core-sections insure a thorough ventilation of the core, while the ventilatingspaces formed between the secondary coil and core and between the primary and secondary coils insure a thorough ventilation of all parts of the converter. By making the core in two sections, as described, I am enabled to wind the coils in a lathe instead of by hand, and as the primary coils are composed of very fine wire a considerable saving in time and expense is eitected by such construction. Again, in event one of the coils should burn out it may be readily removed and replaced by a new one,

As many slight changes in the form of construction and arrangement of parts might be resorted to without departing from my invention, I would have it understood that I do not restrict myself to the particular form and construction of parts shown and described; but

I claim- 1. In a converter, a core made of two piles of blanks, each blank consisting of a long and a short arm, and coils wound around the long arms of each set of blanks, substantially as set forth.

2. A converter-core made in two sections, each section consisting of a 'pile of insulated sheet-metal blanks formed with a long and a short arm, substantially as set forth.

3. A sectional core for converters, made of two piles of sheet-metal blanks, and pins and draw-clamps for securing the two sections together, substantially as set forth.

4. In a converter, the combination, with a core composed of sections, each formed of two arms disposed at right angles to each other, of primary and secondary coils disposed on the longer and parallel arms of said sections, substantially as set forth.

5. In a converter, the combination, with a series of insulated sheet-metal sections, of coils wound on said core so as to have ventilating-spaces between them and the core and between each other, the plates comprising said core having slots therein to produce ventilating'spaces in the center of the coils, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

GUSTAV IFANNKUCIIE.

\Vitnesses:

JOHN G. DOLPH, W. A. CALLANT. 

